{"title":"SVBONY Eyepieces \u0026 Diagonals","description":"\u003cp\u003eSVBONY eyepieces, zoom eyepieces, star diagonals and eyepiece kits. Part of \u003ca href=\"\/collections\/svbony-1\"\u003eSVBONY\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"svbony-sv191-zoom-eyepiece","title":"SVBONY SV191 7.2-21.6mm 1.25″ Zoom Eyepiece","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV191 is a 1.25″ zoom eyepiece that covers 7.2 mm to 21.6 mm in one continuous 3x range. The apparent field widens from 42° at the long end to 65° at the short end, eye relief stays at 18–20 mm throughout, and the optics are a fully multi-coated 7-element, 4-group design with blackened lens edges. It weighs 167 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want to move from a finding view to a high-power planetary view without swapping eyepieces, observe with glasses, or want one compact eyepiece for travel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7.2–21.6 mm continuous zoom:\u003c\/strong\u003e dial in the magnification that suits the seeing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e42°–65° apparent field:\u003c\/strong\u003e the field widens as you zoom to higher power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e18–20 mm eye relief:\u003c\/strong\u003e comfortable with eyeglasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7 elements in 4 groups:\u003c\/strong\u003e fully multi-coated, with blackened lens edges for contrast.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMetal twist-up eyecup.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1.25″ barrel with M28.5 x 0.6 filter thread.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6383866315859845905171996.jpg?v=1791651294\" alt=\"SVBONY SV191 zoom eyepiece installation diagram\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and lunar observing:\u003c\/strong\u003e zoom in until the seeing limits the view, then back off slightly for the sharpest image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble stars and clusters\u003c\/strong\u003e across a range of magnifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTravel kits\u003c\/strong\u003e where one eyepiece replaces several.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, fits any 1.25″ diagonal or focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread for standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith the SVBONY MK127:\u003c\/strong\u003e at 1500 mm focal length the SV191 gives about 69x to 208x, a range that covers most lunar and planetary nights. A 1.25″ diagonal such as the SV188P sits between the eyepiece and the telescope's SCT-to-1.25″ adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eNarrower field at low power:\u003c\/strong\u003e at 21.6 mm the apparent field is 42°, so wide-field sweeping is better served by a dedicated low-power wide-angle eyepiece.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into any 1.25″ diagonal or focuser. Turn the zoom barrel to change magnification and refocus slightly as needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Eye relief is 18–20 mm across the zoom range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Standard 1.25″ filters thread into its M28.5 x 0.6 filter thread.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 7.2–21.6 mm 1.25″ zoom eyepiece with long eye relief and a field that widens to 65°, covering low to high power in one compact eyepiece.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67720868003951,"sku":"W9150A","price":95.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9150a-0_20251231153302_1233.webp?v=1791651468"},{"product_id":"svbony-sv188p-1-25-dielectric-mirror-diagonal","title":"SVBONY SV188P 1.25″ 90° Dielectric Mirror Diagonal","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV188P is a 1.25″ 90° star diagonal with a dielectric-coated mirror rated at 99% reflectivity. The aluminium-alloy body has a 1.25″ nosepiece with an M28.5 x 0.6 filter thread and a 1.25″ eyepiece clamp with a brass compression ring and brass thumbscrew. The mirror is 11 mm thick, and the diagonal weighs 125 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe through a refractor, Maksutov or SCT and want a comfortable viewing position for objects high in the sky, with a bright, high-reflectivity mirror in the light path.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e99% reflectivity dielectric mirror:\u003c\/strong\u003e bright images with minimal light loss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90° viewing angle:\u003c\/strong\u003e comfortable posture when the telescope points high.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass compression ring and thumbscrew:\u003c\/strong\u003e holds the eyepiece securely without scratching the barrel or letting it rotate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM28.5 x 0.6 filter thread\u003c\/strong\u003e on the nosepiece for standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium alloy body\u003c\/strong\u003e with M4 set screws.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing\u003c\/strong\u003e of the Moon, planets, double stars and deep-sky objects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComfortable high-altitude viewing\u003c\/strong\u003e with refractors and catadioptric telescopes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNosepiece:\u003c\/strong\u003e 1.25″ barrel, fits any 1.25″ focuser or visual back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece side:\u003c\/strong\u003e 1.25″ clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the nosepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaksutov and SCT use:\u003c\/strong\u003e these telescopes need a 1.25″ visual back. The SVBONY MK127 includes its SCT-to-1.25″ adapter, so the SV188P slides straight in.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage orientation:\u003c\/strong\u003e like all mirror diagonals, the view is upright but reversed left to right, which is standard for astronomical observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e this listing is the 1.25″ version. 2″ eyepieces need a 2″ diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Slide the nosepiece into the focuser or visual back, tighten the set screw, and insert a 1.25″ eyepiece into the brass compression ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy a dielectric mirror?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA dielectric coating reflects 99% of visible light, more than a standard aluminized mirror, which gives a slightly brighter image.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on a Maksutov such as the MK127?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, through the telescope's SCT-to-1.25″ adapter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 90° diagonal with a 99% reflectivity dielectric mirror and a brass compression clamp, for bright, comfortable visual observing.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67720868855919,"sku":"F9171D","price":61.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9171d-1_20251124095503_3109.webp?v=1791651491"},{"product_id":"svbony-sv230-8-20mm-aspheric-zoom-eyepiece","title":"SVBONY SV230 8-20mm Aspheric Zoom Eyepiece (1.25″ and 2″)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-1_20250905190206_8933.jpg?v=1791667829\" alt=\"SVBONY SV230 8-20mm aspheric zoom eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV230 is an 8–20 mm click-stop zoom eyepiece with both 1.25″ and 2″ barrels. The apparent field runs from 72° at 8 mm to 57° at 20 mm, eye relief is 17–19 mm, and the optics are a fully multi-coated 9-element, 6-group design that includes double-sided aspheric lenses to control edge distortion. It weighs 500 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-13_20250905190937_1492.jpg?v=1791667829\" alt=\"SVBONY SV230 continuous zoom from 8mm to 20mm\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-3_20250905190338_3816.jpg?v=1791667829\" alt=\"SVBONY SV230 panoramic wide-angle field of view\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-4_20250905190405_2845.jpg?v=1791667830\" alt=\"SVBONY SV230 apparent field from 72 to 57 degrees across the zoom\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want one eyepiece that covers medium to high power across the planets, the Moon and brighter deep-sky objects, observe with glasses, or use both 1.25″ and 2″ diagonals.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8–20 mm zoom with click-stops:\u003c\/strong\u003e repeatable magnification steps that are easy to find in the dark.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e72° to 57° apparent field:\u003c\/strong\u003e the field widens toward the high-power end, where a wide view helps keep a planet in the eyepiece on an undriven mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e9 elements in 6 groups, including aspherics:\u003c\/strong\u003e double-sided aspheric glass reduces distortion at the field edge; all optics are fully multi-coated with blackened lens edges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17–19 mm eye relief:\u003c\/strong\u003e with an adjustable rubber eyecup, usable with eyeglasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal across the zoom range:\u003c\/strong\u003e focus holds as you zoom, with at most a small touch-up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ and 2″ barrels:\u003c\/strong\u003e both included, stainless steel, threaded M28.5 x 0.6 and M48 x 0.75 for filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDioptrx compatible:\u003c\/strong\u003e SVBONY lists Dioptrx mounting as supported.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-14_20250905191014_1481.jpg?v=1791667829\" alt=\"SVBONY SV230 long eye relief for eyeglass wearers\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-16_20250905191043_9860.jpg?v=1791667830\" alt=\"SVBONY SV230 adjustable rubber eyecup\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-15_20250905191027_4634.jpg?v=1791667829\" alt=\"SVBONY SV230 rubber eyecup detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eZoom eyepieces trade some field width for convenience, and edge sharpness is where simpler designs give ground. The SV230 uses nine elements in six groups, with double-sided aspheric lenses that SVBONY specifies to suppress distortion toward the field edge. Because the apparent field grows as focal length shortens, the true field shrinks less than it would with a fixed-field zoom when you step up in power.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-9_20250905190716_8424.jpg?v=1791667829\" alt=\"SVBONY SV230 aspheric lens design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-11_20250905190845_5122.jpg?v=1791667830\" alt=\"SVBONY SV230 fully multi-coated optics\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-12_20250905190912_0739.jpg?v=1791667829\" alt=\"SVBONY SV230 blackened lens edges\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and lunar observing:\u003c\/strong\u003e step up through the click-stops until the seeing sets the limit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClusters and brighter deep-sky objects:\u003c\/strong\u003e the 20 mm end gives a moderate-power starting view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble stars:\u003c\/strong\u003e fine-tune magnification to split a pair.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-10_20250905190829_2113.jpg?v=1791667829\" alt=\"SVBONY SV230 parfocal zoom\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrels:\u003c\/strong\u003e 1.25″ and 2″ barrels are both included, so it fits either size of diagonal or focuser.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the 1.25″ barrel and M48 x 0.75 on the 2″ barrel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera projection:\u003c\/strong\u003e SVBONY notes an M43 T-mount connection through an M43-T adapter, sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e divide your telescope's focal length by the eyepiece focal length. On a 1000 mm telescope the SV230 gives 50x at 20 mm and 125x at 8 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-5_20250905190503_9665.jpg?v=1791667829\" alt=\"SVBONY SV230 dual 1.25 inch and 2 inch interfaces\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-7_20250905190610_2790.jpg?v=1791667829\" alt=\"SVBONY SV230 1.25 inch and 2 inch barrels\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9185a-8_20250905190656_2263.jpg?v=1791667829\" alt=\"SVBONY SV230 astigmatism corrector support and M43 T-mount\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize and weight:\u003c\/strong\u003e at 500 g and 60 mm outer diameter it is a substantial eyepiece; balance on lighter alt-az mounts may need adjusting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera adapter:\u003c\/strong\u003e the M43-T adapter for camera projection is not included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Choose the 1.25″ or 2″ barrel to suit your diagonal, insert it, and turn the zoom ring to a click-stop. Focus holds across the range with at most a small adjustment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Eye relief is 17–19 mm and the rubber eyecup adjusts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 1.25″ filters thread onto the 1.25″ barrel (M28.5 x 0.6) and 2″ filters onto the 2″ barrel (M48 x 0.75).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it differ from the SV215?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe SV230 covers 8–20 mm with a field up to 72° and longer eye relief; the SV215 covers the shorter 3–8 mm planetary range in a 1.25″ barrel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 8–20 mm click-stop zoom eyepiece with aspheric optics, a 72° to 57° field and 17–19 mm eye relief, supplied with both 1.25″ and 2″ barrels.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721422864495,"sku":"W9185A","price":427.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9185A-0_20251210141527_5819.webp?v=1791665183"},{"product_id":"svbony-sv223-2-clicklock-dielectric-mirror-diagonal","title":"SVBONY SV223 2″ 90° Clicklock Dielectric Mirror Diagonal","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870419614457549257247.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch 90 degree dielectric mirror diagonal\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV223 2″ is a 90° mirror star diagonal with a dielectric-coated mirror rated at more than 99% reflectivity and 1\/10λ flatness on an 11.5 mm thick substrate. A Clicklock clamp holds 2″ eyepieces and accessories, a 2″-to-1.25″ adapter is included, and the telescope-side barrel carries an M48 x 0.75 filter thread. Clear aperture is 43 mm, optical length is approximately 109.1 mm, and it weighs 573.7 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870426108640766781949.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch 90 degree viewing angle\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe through a refractor, SCT or Maksutov with a 2″ focuser or visual back and want a comfortable viewing angle, a secure grip on heavy 2″ eyepieces, and the option to use 1.25″ eyepieces through the same diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDielectric mirror, \u0026gt;99% reflectivity:\u003c\/strong\u003e 1\/10λ flatness on an 11.5 mm thick substrate for a stable, flat reflecting surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClicklock clamp:\u003c\/strong\u003e a twist-to-lock clamp that centres and holds 2″ eyepieces or accessories quickly and securely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e43 mm clear aperture:\u003c\/strong\u003e passes the full field of wide 2″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompression rings:\u003c\/strong\u003e stainless steel compression rings on both the diagonal and the adapter help prevent barrels from marring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 x 0.75 filter thread:\u003c\/strong\u003e on the telescope-side barrel for 2″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal construction:\u003c\/strong\u003e 573.7 g.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870421862665058543660.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch Clicklock locking mechanism\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870423083016402927862.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch high-reflectivity dielectric mirror\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870425031691949714654.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch compression ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing\u003c\/strong\u003e with refractors and catadioptric telescopes, from wide-field deep-sky sweeps to high-power planetary views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy 2″ eyepieces\u003c\/strong\u003e and zoom eyepieces that benefit from a secure clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMixed eyepiece collections\u003c\/strong\u003e, using the included 2″-to-1.25″ adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870427886372636544287.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch before and after use comparison\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 2″ barrel, fits 2″ focusers and visual backs; M48 x 0.75 thread for 2″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece side:\u003c\/strong\u003e 2″ Clicklock clamp; 1.25″ eyepieces fit with the included adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical length:\u003c\/strong\u003e approximately 109.1 mm, worth accounting for when reaching focus on refractors with limited inward travel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870428911309512628163.jpg?v=1791667835\" alt=\"SVBONY SV223 2 inch diagonal with 1.25 inch adapter\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSV223 2″ 90° Clicklock dielectric diagonal\u003c\/li\u003e\n\u003cli\u003e2″ to 1.25″ adapter\u003c\/li\u003e\n\u003cli\u003eM4 screw (1)\u003c\/li\u003e\n\u003cli\u003eDust cap (1)\u003c\/li\u003e\n\u003cli\u003eDust plug (1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage orientation:\u003c\/strong\u003e the view is upright but mirror-reversed left to right, as with any single-mirror diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual use:\u003c\/strong\u003e a diagonal is for eyepiece observing; imaging cameras usually attach straight-through.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight path:\u003c\/strong\u003e the 109.1 mm optical length adds to the focus position. If you are unsure whether your telescope reaches focus with a 2″ diagonal, send us the model and we will check it with you.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Insert the 2″ barrel into your focuser or visual back, then insert an eyepiece and twist the Clicklock ring to lock it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 1.25″ eyepieces?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The included 2″-to-1.25″ adapter fits into the Clicklock clamp.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 2″ filters thread onto the M48 x 0.75 telescope-side barrel, so one filter serves every eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy a dielectric mirror?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDielectric coatings reflect more than 99% of the light and are more durable than standard aluminium coatings.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ 90° dielectric mirror diagonal with \u0026gt;99% reflectivity, a Clicklock eyepiece clamp, a 43 mm clear aperture and a 1.25″ adapter included.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721428828271,"sku":"W9180B","price":153.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9180b-1_20250807165619_0071.jpg?v=1791665258"},{"product_id":"svbony-sv223-1-25-clicklock-dielectric-mirror-diagonal","title":"SVBONY SV223 1.25″ 90° Clicklock Dielectric Mirror Diagonal","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029085378776593191571.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch 90 degree dielectric mirror diagonal\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV223 1.25″ is a 90° mirror star diagonal with a dielectric-coated mirror rated at more than 99% reflectivity and 1\/10λ flatness on an 11.5 mm thick substrate. A Clicklock clamp holds 1.25″ eyepieces, an internal safety stop keeps barrels off the mirror, and the telescope-side barrel carries an M28.5 x 0.6 filter thread. Clear aperture is 25 mm, optical length is approximately 85.5 mm, and it weighs 249 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387028351111713731031816.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch diagonal setup on a telescope\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe through a refractor, SCT or Maksutov with a 1.25″ eyepiece holder and want a comfortable viewing angle with a quick, secure eyepiece clamp.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDielectric mirror, \u0026gt;99% reflectivity:\u003c\/strong\u003e 1\/10λ flatness on an 11.5 mm thick optical flat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClicklock clamp:\u003c\/strong\u003e a twist-to-lock clamp for fast, centred eyepiece changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal safety stop:\u003c\/strong\u003e prevents eyepiece barrels from reaching the mirror.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel compression ring:\u003c\/strong\u003e helps prevent barrels from marring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachined aluminium body:\u003c\/strong\u003e with internal anti-reflection baffling for contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM28.5 x 0.6 filter thread:\u003c\/strong\u003e on the telescope-side barrel for 1.25″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037600071560638482077.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch Clicklock locking mechanism\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029116771902277125595.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch 99 percent reflectivity mirror\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual observing\u003c\/strong\u003e with refractors and catadioptric telescopes that take 1.25″ accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and lunar sessions\u003c\/strong\u003e where frequent eyepiece changes benefit from the Clicklock clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and travel setups\u003c\/strong\u003e where a 249 g diagonal keeps the load down.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056485272951833429777.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch before and after use comparison\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387038822142679885738236.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch diagonal suitable for many telescopes\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 1.25″ barrel, fits 1.25″ focusers and eyepiece holders; M28.5 x 0.6 thread for 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece side:\u003c\/strong\u003e 1.25″ Clicklock clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical length:\u003c\/strong\u003e approximately 85.5 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6382735804362481463706283.jpg?v=1791665293\" alt=\"SVBONY SV223 1.25″ Clicklock diagonal connection to a telescope\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056354374049444298003.jpg?v=1791667841\" alt=\"SVBONY SV223 1.25 inch diagonal connection to a telescope\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056542247450609504711.jpg?v=1791667842\" alt=\"SVBONY SV223 1.25 inch diagonal in use with an eyepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSV223 1.25″ 90° Clicklock dielectric diagonal\u003c\/li\u003e\n\u003cli\u003eM4 screw (1)\u003c\/li\u003e\n\u003cli\u003eDust cap (1)\u003c\/li\u003e\n\u003cli\u003eDust plug (1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage orientation:\u003c\/strong\u003e the view is upright but mirror-reversed left to right, as with any single-mirror diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e 2″ eyepieces need the 2″ version of the SV223.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual use:\u003c\/strong\u003e a diagonal is for eyepiece observing; imaging cameras usually attach straight-through.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Insert the barrel into your focuser or eyepiece holder, then insert an eyepiece and twist the Clicklock ring to lock it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 1.25″ filters thread onto the M28.5 x 0.6 telescope-side barrel, so one filter serves every eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy a dielectric mirror?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDielectric coatings reflect more than 99% of the light and are more durable than standard aluminium coatings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit an SCT or Maksutov?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, on any telescope that accepts a 1.25″ barrel, including through an SCT-to-1.25″ visual back.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 90° dielectric mirror diagonal with \u0026gt;99% reflectivity, a Clicklock eyepiece clamp and an internal safety stop, at 249 g.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721430007919,"sku":"W9180A","price":132.23,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9180a_20250806142557_5256.jpg?v=1791665282"},{"product_id":"svbony-sv152-20mm-illuminated-crosshair-eyepiece","title":"SVBONY SV152 20mm 70° Illuminated Crosshair Eyepiece (1.25″)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650922972046035213800.jpg?v=1791669940\" alt=\"SVBONY SV152 20mm illuminated crosshair eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV152 is a 1.25″, 20 mm eyepiece with a 70° apparent field and an illuminated single crosshair reticle. A clip-on LED illuminator lights the crosshair red, with adjustable brightness, so you can centre a star precisely without losing night vision. The optical design is 5 elements in 4 groups, fully multi-coated, with 16 mm eye relief and a 25 mm field stop. It runs on two 1.5 V button cells and weighs 221 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650923167195637140395.jpg?v=1791669940\" alt=\"SVBONY SV152 illuminated crosshair eyepiece overview\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you need a reticle eyepiece for centring stars during mount alignment, manual guiding, aligning a finder or guide scope with your main telescope, or checking that a target sits dead-centre before handing over to a camera.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIlluminated single crosshair:\u003c\/strong\u003e red LED with adjustable brightness to suit faint or bright stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20 mm, 70° field:\u003c\/strong\u003e a wide view that makes it easy to find a star before centring it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16 mm eye relief:\u003c\/strong\u003e comfortable viewing with a rubber eyecup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated, blackened lens edges:\u003c\/strong\u003e good light transmission on faint stars and reduced internal reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-step anodised aluminium body:\u003c\/strong\u003e matte finish that resists glare.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650923307153642236390.jpg?v=1791669940\" alt=\"SVBONY SV152 crosshair reticle detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650923418200729117336.jpg?v=1791669940\" alt=\"SVBONY SV152 LED illuminator brightness control\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650923502022782309863.jpg?v=1791669940\" alt=\"SVBONY SV152 eyepiece feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SV152 uses a 5-element, 4-group design with full multi-coating and blackened edges. The 25 mm field stop with a 20 mm focal length gives a true field that is generous for a reticle eyepiece, and the crosshair sits at the focal plane so it stays sharp as you focus on the star. The bottom of the barrel carries a standard M28.5 x 0.6 filter thread.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650923559350397917334.jpg?v=1791669940\" alt=\"SVBONY SV152 eyepiece optical structure\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount alignment\u003c\/strong\u003e by centring alignment stars precisely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual guiding\u003c\/strong\u003e with a guide scope or off-axis setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinder and guide-scope alignment\u003c\/strong\u003e with the main telescope.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650923616490278064067.jpg?v=1791669940\" alt=\"SVBONY SV152 illuminated eyepiece in use\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, fits any 1.25″ focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread:\u003c\/strong\u003e M28.5 x 0.6 standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e two 1.5 V button cells, included.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650923645861897518163.jpg?v=1791669940\" alt=\"SVBONY SV152 eyepiece dimensions\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x 1.25″ SWA 70° 20 mm eyepiece\u003c\/li\u003e\n\u003cli\u003e1 x LED illuminator\u003c\/li\u003e\n\u003cli\u003e2 x rubber eyepiece caps\u003c\/li\u003e\n\u003cli\u003e2 x 1.5 V button cells\u003c\/li\u003e\n\u003cli\u003e1 x lens cloth\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378650923706432435645125.jpg?v=1791669940\" alt=\"SVBONY SV152 illuminated eyepiece package contents\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBatteries:\u003c\/strong\u003e two 1.5 V button cells are included; spares are a standard size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle crosshair:\u003c\/strong\u003e the reticle is a plain crosshair rather than a double-line or scaled reticle.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Fit the illuminator, insert the eyepiece in the focuser, focus on a star and turn up the LED until the crosshair is just visible.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for general observing?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. With the LED off it is a 20 mm, 70° eyepiece, though the crosshair remains in the view.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the brightness adjustable?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The LED brightness is adjustable so the crosshair can be set dim for faint stars.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 20 mm, 70° 1.25″ eyepiece with an adjustable red-lit crosshair for centring stars, aligning finders and guiding by eye.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722188587119,"sku":"W9115A","price":91.2,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9115a-0_20251231153727_0043.webp?v=1791669940"},{"product_id":"svbony-sv135-7-21mm-zoom-eyepiece-57-40","title":"SVBONY SV135 1.25″ 7–21mm 57°–40° Zoom Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387038656382229122243062.jpg\" alt=\"SVBONY SV135 7-21mm 57-40 degree zoom eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV135 is a 1.25″ zoom eyepiece that covers 7 mm to 21 mm with a twist of the barrel, giving a 57° apparent field at the short end and 40° at the long end. It uses a fully multi-coated 4-group, 6-element design, keeps 16.3–18 mm of eye relief across the range, and has an M28.5 × 0.6 thread for 1.25″ filters. It is 93 mm long and weighs 133 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387089713054019584231556.jpg\" alt=\"SVBONY SV135 zoom eyepiece focal length range\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want one eyepiece that covers the most-used magnification range in a 1.25″ focuser — framing a target at 21 mm, then zooming in to 7 mm when the seeing allows — for the Moon, planets, double stars and star clusters. The 16.3–18 mm eye relief suits observers who keep their glasses on.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7–21 mm linear zoom:\u003c\/strong\u003e continuous magnification change without swapping eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e57°–40° apparent field:\u003c\/strong\u003e widest at 7 mm, where a wider field helps keep planets in view on an undriven mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16.3–18 mm eye relief:\u003c\/strong\u003e comfortable with or without eyeglasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated optics:\u003c\/strong\u003e 4 groups, 6 elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium housing with rubberized collar:\u003c\/strong\u003e non-slip grip, including in the cold or with gloves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM28.5 × 0.6 filter thread:\u003c\/strong\u003e takes SVBONY and other standard 1.25″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387030927267458094266616.jpg\" alt=\"SVBONY SV135 zoom eyepiece multi-coated optics\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056370938381184609973.jpg\" alt=\"SVBONY SV135 zoom eyepiece smooth zoom mechanism\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387039780022816254828456.jpg\" alt=\"SVBONY SV135 zoom eyepiece aluminium housing and grip\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SV135 is a linear zoom: the focal length changes in proportion to the barrel rotation, with six elements in four groups and full multi-coating on the air-glass surfaces. As in most zooms, the apparent field narrows as focal length increases — here from 57° at 7 mm to 40° at 21 mm — while eye relief stays between 16.3 mm and 18 mm. On a 1000 mm focal-length telescope, the range works out to roughly 48× to 143×.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary observing:\u003c\/strong\u003e zoom in to match the seeing on Jupiter, Saturn and Mars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar observing:\u003c\/strong\u003e move from whole-disc views to crater detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStar clusters and double stars:\u003c\/strong\u003e frame at 21 mm, then tighten.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutreach and travel kits:\u003c\/strong\u003e one eyepiece in place of three or four.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037775927770828101338.jpg\" alt=\"SVBONY SV135 zoom eyepiece filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, fits standard 1.25″ focusers and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 × 0.6 thread for SVBONY 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBundles:\u003c\/strong\u003e SVBONY also offers this eyepiece in bundles with the SV188P and other accessories; contact us if you would like one of those combinations.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6380488605269154815957243.jpg\" alt=\"SVBONY SV135 zoom eyepiece eye relief for eyeglass wearers\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6380488603942389369532969.jpg\" alt=\"SVBONY SV135 zoom eyepiece 1.25 inch barrel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6380488608242116548192749.jpg\" alt=\"SVBONY SV135 zoom eyepiece dimensions\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField narrows with focal length:\u003c\/strong\u003e 40° at 21 mm is narrower than a fixed wide-field eyepiece of the same focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e there is no 2″ barrel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree SV135 versions:\u003c\/strong\u003e SVBONY sells 52°–36°, 57°–40° (this one) and 60°–40° versions with different optical designs and weights.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It drops into a 1.25″ focuser or diagonal like any eyepiece; twist the barrel to zoom and refocus as needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astrophotography?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt is a visual eyepiece. It can be used for simple eyepiece-projection or smartphone shots, but its main purpose is observing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDivide your telescope's focal length by 7 and by 21. On a 1000 mm telescope that is about 143× at 7 mm and 48× at 21 mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it differ from the other SV135 versions?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis version has a 4-group, 6-element design with a 57°–40° field and 16.3–18 mm eye relief; the 52°–36° version uses 3 groups\/5 elements and the 60°–40° version 4 groups\/7 elements.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 133 g, 1.25″ zoom eyepiece covering 7–21 mm with a 57°–40° field and 16.3–18 mm eye relief — a single eyepiece for lunar, planetary and cluster observing.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"SV135","offer_id":67722219225199,"sku":"W9105A","price":59.85,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9105a-0_20251231152339_2821.webp?v=1791670075"},{"product_id":"svbony-sv188-1-25-mirror-diagonal","title":"SVBONY SV188 1.25″ 90° Mirror Diagonal for Refractors","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371934719254349607262056.jpg?v=1791669914\" alt=\"SVBONY SV188 1.25 inch 90 degree mirror diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV188 is a 1.25″ 90° mirror star diagonal for refractors. It turns the light path through a right angle so the eyepiece sits at a comfortable position when you observe high in the sky. The mirror has a published reflectivity of 90%, the housing is metal, and a single thumbscrew holds 1.25″ eyepieces. The nosepiece fits 1.25″ focusers directly and 2″ focusers with an adapter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe visually with a refractor that takes 1.25″ eyepieces and want an upright-angle viewing position for the Moon, planets and deep-sky objects, or if you need a replacement for a lost or damaged diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e90° mirror diagonal:\u003c\/strong\u003e places the eyepiece at a right angle to the tube for comfortable viewing near the zenith.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90% reflectivity:\u003c\/strong\u003e the published reflectance of the mirror coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision-machined alignment:\u003c\/strong\u003e SVBONY machines the mirror seat to hold optical alignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened internal threads:\u003c\/strong\u003e threaded baffling inside the barrel reduces glare and stray reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal housing\u003c\/strong\u003e with a single-screw 1.25″ eyepiece clamp.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371934719246909342776934.jpg?v=1791669913\" alt=\"SVBONY SV188 mirror diagonal precision-aligned mirror detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371934717356889712318365.jpg?v=1791669913\" alt=\"SVBONY SV188 mirror diagonal blackened internal threads detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing\u003c\/strong\u003e with a 1.25″ eyepiece set on a refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky viewing near the zenith\u003c\/strong\u003e, where a straight-through view is awkward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement diagonal\u003c\/strong\u003e for entry-level and travel refractors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373085363400990158429545.jpg?v=1791669914\" alt=\"SVBONY SV188 mirror diagonal on a refractor\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece side:\u003c\/strong\u003e 1.25″, one clamping screw.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 1.25″ nosepiece; 2″ focusers need a 2″-to-1.25″ adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope type:\u003c\/strong\u003e designed for refractors. SVBONY names refractors such as Celestron EQ and Meade Infinity models as examples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for Newtonians:\u003c\/strong\u003e a Newtonian's focal plane sits too close to the focuser for a diagonal to reach focus.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373085365203498263994258.jpg?v=1791669914\" alt=\"SVBONY SV188 mirror diagonal eyepiece clamp and nosepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror-reversed image:\u003c\/strong\u003e like all 90° mirror diagonals, it shows an upright image that is reversed left to right. For a fully correct image, an erecting prism diagonal is the alternative.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefractors (and similar) only:\u003c\/strong\u003e it is not suitable for Newtonian reflectors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for this diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the 1.25″ focuser and the eyepiece slides into the diagonal, each held by a thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work in my 2″ focuser?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, with a 2″-to-1.25″ adapter in the focuser.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it on a Newtonian?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. SVBONY lists it as not suitable for Newtonians.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the image orientation?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eUpright but mirror-reversed left to right, as with any single-mirror diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″ 90° metal-bodied mirror diagonal with 90% reflectivity and blackened internal threads, for comfortable visual observing with a refractor.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722222076015,"sku":"F9171A","price":34.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9171a---9-_20250806105250_4152_20260810154813_1315.webp?v=1791670090"},{"product_id":"svbony-sv136-34mm-72-degree-eyepiece","title":"SVBONY SV136 2″ 34mm 72° Wide-Field Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386060635245778857423486.webp\" alt=\"SVBONY SV136 34mm 72 degree 2 inch eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV136 34 mm is a 2″ wide-field eyepiece with a 72° apparent field of view and a 40 mm field stop. Its fully multi-coated 5-element, 4-group design gives 24 mm of eye relief, and the barrel carries a standard 2″ (M48 × 0.75) filter thread. At 34 mm it is a low-power, maximum-field eyepiece — the one that frames large nebulae, open clusters and star fields, and the easiest to find targets with.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386060759794373434212270.webp\" alt=\"SVBONY SV136 34mm eyepiece 72 degree wide field\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if your telescope has a 2″ focuser or diagonal and you want the widest true field it can deliver — for sweeping the Milky Way, framing the Double Cluster or the Veil, or as a finding eyepiece before switching to higher power. The 24 mm eye relief and folding eyecup work for observers with or without glasses.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e72° apparent field:\u003c\/strong\u003e a wide, immersive view at low power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 mm field stop:\u003c\/strong\u003e close to the practical maximum for a 2″ barrel, so the true field is about as wide as your telescope allows.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24 mm eye relief:\u003c\/strong\u003e with a fixed folding rubber eyecup, usable with or without glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated, blackened edges:\u003c\/strong\u003e for contrast and to cut internal reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-step anodized aluminium body:\u003c\/strong\u003e matte finish that resists reflections and glare.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ filter thread (M48 × 0.75):\u003c\/strong\u003e takes SVBONY 2″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386060762352539691247455.webp\" alt=\"SVBONY SV136 34mm eyepiece deep-sky observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386060765270886588291832.webp\" alt=\"SVBONY SV136 34mm eyepiece multi-coated optics\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SV136 uses five elements in four groups, fully multi-coated, to spread a 72° field across a 40 mm field stop. Because true field is set by the field stop divided by the telescope's focal length, a 40 mm stop gives roughly 2.3° of sky on a 1000 mm telescope at about 29×, and close to 4° on a 600 mm refractor. The exit pupil grows with focal ratio — about 6.8 mm at f\/5 — which is worth matching to your telescope and sky conditions.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge nebulae:\u003c\/strong\u003e the Veil, North America and Orion nebulae, especially with a 2″ nebula filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen clusters and star fields:\u003c\/strong\u003e the Double Cluster, the Pleiades and Milky Way sweeping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinding and framing:\u003c\/strong\u003e locate targets at low power before moving to a shorter eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoon and bright planets at low power:\u003c\/strong\u003e whole-disc lunar views.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386060766812652829924893.webp\" alt=\"SVBONY SV136 34mm eyepiece folding eyecup\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 2″ only — needs a 2″ focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M48 × 0.75 thread for SVBONY 2″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6386060768741290921188720.webp\" alt=\"SVBONY SV136 34mm eyepiece 2 inch barrel and filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ focuser required:\u003c\/strong\u003e it does not fit 1.25″-only focusers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit pupil:\u003c\/strong\u003e on fast telescopes (f\/4–f\/5) the exit pupil is large; on Newtonians the secondary shadow can become visible in daylight or bright skies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish this eyepiece's weight.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into a 2″ focuser or diagonal and is held by the clamp screw or compression ring like any 2″ eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I wear glasses with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The 24 mm eye relief and folding eyecup are designed to work with or without glasses.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eLow-power, wide-field observing of large nebulae, open clusters and star fields, and as a finding eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work in my 1.25″ focuser?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo; it has a 2″ barrel only.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″, 34 mm eyepiece with a 72° field, a 40 mm field stop and 24 mm eye relief — a low-power, wide-field eyepiece for telescopes with a 2″ focuser.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722227581039,"sku":"F9172D","price":99.75,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9172d-1_20250807165016_1722.jpg?v=1791670116"},{"product_id":"svbony-sv154-15mm-70-degree-eyepiece","title":"SVBONY SV154 15mm 70° Super Wide Angle Eyepiece (1.25″)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371980434197371481911336.jpg?v=1791670150\" alt=\"SVBONY SV154 15mm 70° eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV154 15 mm is a 1.25″ super wide angle eyepiece with a 70° apparent field of view. Its 5 elements in 4 groups are fully multi-coated, with blackened lens edges and anti-reflection threads inside the barrel. It has 13 mm of eye relief, an 18.8 mm field stop, a twist-up eyecup and a barrel safety recess, and the barrel is threaded for standard 1.25″ filters (M28.5 x 0.6).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a medium-power eyepiece with a wider view than a standard Plössl, for framing star clusters, the Moon and larger planetary nebulae, or for following planets on a mount without tracking.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e70° apparent field:\u003c\/strong\u003e a wide, immersive view at medium power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13 mm eye relief\u003c\/strong\u003e with a twist-up eyecup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 elements \/ 4 groups, fully multi-coated:\u003c\/strong\u003e high-index glass for sharp, contrasty views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened lens edges and threaded interior:\u003c\/strong\u003e controls stray light for contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety recess on the barrel:\u003c\/strong\u003e reduces the chance of the eyepiece slipping out of a focuser or diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371980434197684081486003.jpg?v=1791670150\" alt=\"SVBONY SV154 15mm eyepiece feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103651844209534372410.jpg?v=1791670150\" alt=\"SVBONY SV154 15mm eyepiece construction\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWith a 15 mm focal length and an 18.8 mm field stop, the SV154 delivers a 70° apparent field. Magnification is your telescope's focal length divided by 15; on a 900 mm telescope that is 60x. The fully multi-coated 5-element, 4-group layout keeps the view bright, and the blackened edges and threaded barrel interior control internal reflections.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103673260687509520447.jpg?v=1791670150\" alt=\"SVBONY SV154 15mm eyepiece optical structure\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing\u003c\/strong\u003e at medium power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen and globular clusters\u003c\/strong\u003e framed with surrounding star field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneral-purpose observing\u003c\/strong\u003e as a mid-range eyepiece in a 1.25″ set.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, fits all standard 1.25″ focusers and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread:\u003c\/strong\u003e M28.5 x 0.6 for standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith a Barlow:\u003c\/strong\u003e SVBONY also offers the SV154 with a 2x or 3x Barlow as bundle styles; ask us if you would like one.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103678402672102548124.jpg?v=1791670150\" alt=\"SVBONY SV154 15mm eyepiece specifications\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye relief:\u003c\/strong\u003e 13 mm. Some eyeglass wearers prefer longer; the twist-up eyecup can be lowered for glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eListing:\u003c\/strong\u003e this is the eyepiece on its own.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into any 1.25″ focuser or diagonal and is held by the usual set screw or compression ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDivide your telescope's focal length by 15. A 650 mm telescope gives about 43x; a 1250 mm telescope about 83x.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use filters with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The barrel takes standard 1.25″ filters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 15 mm, 70° 1.25″ eyepiece with 13 mm eye relief and fully multi-coated optics that gives a wide medium-power view in any 1.25″ focuser.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"SV154","offer_id":67722233643119,"sku":"W9117A","price":59.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9117a-0_20251231154035_3991.webp?v=1791670149"},{"product_id":"svbony-sv154-2-26mm-70-degree-eyepiece","title":"SVBONY SV154 2″ 26mm 70° Super Wide Angle Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20260314094033_8834.webp?v=1791670150\" alt=\"SVBONY SV154 2″ 26mm eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV154 26 mm is a 2″ super wide angle eyepiece with a 70° apparent field of view and a 32.3 mm field stop. Its 5 elements in 3 groups are fully multi-coated, with blackened lens edges and anti-reflection threads. Eye relief is 20 mm, the eyecup folds down, the barrel has a safety recess and is threaded for 2″ filters (M48 x 0.75). It weighs 305 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20260314094042_9063.webp?v=1791670150\" alt=\"SVBONY SV154 2″ 26mm eyepiece overview\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if your telescope has a 2″ focuser or diagonal and you want a low-power, wide-field eyepiece for sweeping star fields, finding objects and framing large nebulae and clusters, including if you observe with glasses.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e70° apparent field, 32.3 mm field stop:\u003c\/strong\u003e a wide true field at low power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20 mm eye relief:\u003c\/strong\u003e comfortable viewing, with a fold-down rubber eyecup for eyeglass wearers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 elements \/ 3 groups, fully multi-coated:\u003c\/strong\u003e high-index glass for sharp, high-contrast views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened edges and anti-reflection threads:\u003c\/strong\u003e maximise contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety recess:\u003c\/strong\u003e reduces the chance of the eyepiece slipping out of the focuser.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3_20260314094057_6593.webp?v=1791670150\" alt=\"SVBONY SV154 2″ 26mm eyepiece feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/4_20260314094105_8919.webp?v=1791670150\" alt=\"SVBONY SV154 2″ 26mm eyepiece construction\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 26 mm focal length with a 32.3 mm field stop takes advantage of the 2″ barrel: the field stop is larger than a 1.25″ barrel can accept, which is what gives the wider true field. Magnification is your telescope's focal length divided by 26; on a 1000 mm telescope that is about 38x. The fully multi-coated 5-element, 3-group layout keeps faint fields bright.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/5_20260314094112_4671.webp?v=1791670150\" alt=\"SVBONY SV154 2″ 26mm eyepiece optical structure\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-power deep-sky observing\u003c\/strong\u003e of large nebulae, clusters and Milky Way star fields.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinding eyepiece\u003c\/strong\u003e for locating targets before switching to higher power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhole-disc lunar views\u003c\/strong\u003e on longer focal length telescopes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 2″, for 2″ focusers and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread:\u003c\/strong\u003e M48 x 0.75 for standard 2″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6_20260314094120_9246.webp?v=1791670150\" alt=\"SVBONY SV154 2″ 26mm eyepiece specifications\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ focuser or diagonal needed:\u003c\/strong\u003e it does not fit a 1.25″-only focuser. If you are not sure which your telescope has, send us the model and we will check.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 305 g, worth allowing for in balance on lighter mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into a 2″ focuser or diagonal and is held by the set screw or compression ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I wear glasses with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The 20 mm eye relief and fold-down eyecup are designed with eyeglass wearers in mind.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDivide your telescope's focal length by 26. A 750 mm telescope gives about 29x.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″, 26 mm, 70° eyepiece with 20 mm eye relief that gives wide, low-power views in any 2″ focuser.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722234069103,"sku":"W9117B","price":71.25,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9117b-0_20251231154312_5150.webp?v=1791670150"},{"product_id":"svbony-sv131-32mm-plossl-eyepiece","title":"SVBONY SV131 1.25″ 32mm Plossl Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373092571815565327658865.jpg?v=1791669868\" alt=\"SVBONY SV131 32mm Plossl eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV131 32 mm is a 1.25″ Plössl eyepiece with a 48° apparent field of view, 19 mm of eye relief and a 25 mm field stop. It uses a fully multi-coated 2-group, 4-element design with matte-blackened lens edges, a metal body with a rubber non-slip ring and folding rubber eyecup, and an M28.5 × 0.6 thread for 1.25″ filters. It measures Ø61 × 104 mm and weighs 116.5 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373092573103769315691428.jpg?v=1791669868\" alt=\"SVBONY SV131 32mm Plossl eyepiece optical coatings\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if your telescope has a 1.25″ focuser and you want a low-power eyepiece with the widest true field that size allows — for finding objects, sweeping star fields and framing clusters, nebulae and comets. The 19 mm eye relief works for observers who wear glasses.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e32 mm focal length, 48° field:\u003c\/strong\u003e low power and a 25 mm field stop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e19 mm eye relief:\u003c\/strong\u003e comfortable for long sessions, with or without glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated Plössl:\u003c\/strong\u003e 2 groups, 4 elements, with blackened edges to suppress stray light.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFolding rubber eyecup and non-slip ring.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM28.5 × 0.6 filter thread:\u003c\/strong\u003e takes SVBONY and other standard 1.25″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373092574596922109615991.jpg?v=1791669868\" alt=\"SVBONY SV131 32mm Plossl eyepiece filter thread and barrel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinding and framing:\u003c\/strong\u003e locate targets at low power before switching up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen clusters and star fields:\u003c\/strong\u003e the Pleiades, the Beehive and Milky Way sweeping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNebulae and comets:\u003c\/strong\u003e brighter, lower-power views of extended objects.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9101a-1_20250807091309_6359.jpg?v=1791670289\" alt=\"SVBONY SV131 32mm Plossl eyepiece with rubber eyecup for star cluster and nebula viewing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, for standard 1.25″ focusers and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 × 0.6 thread for 1.25″ filters and adapter rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMagnification:\u003c\/strong\u003e divide your telescope's focal length by 32 — for example about 22× on a 700 mm refractor.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373092575802240234012940.jpg?v=1791669868\" alt=\"SVBONY SV131 32mm Plossl eyepiece eyecup and grip\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e48° field:\u003c\/strong\u003e a classic Plössl field, narrower than wide-angle designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit pupil:\u003c\/strong\u003e on fast telescopes a 32 mm eyepiece gives a large exit pupil, which suits dark skies and younger eyes best.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into any 1.25″ focuser or diagonal and is held by the set screw or compression ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The 19 mm eye relief and folding rubber eyecup are designed for use with or without glasses.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it take filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The barrel is threaded M28.5 × 0.6 for 1.25″ filters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy choose a 32 mm Plössl?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIn a 1.25″ barrel, a 32 mm Plössl gives close to the widest true field available, which makes it the natural finding and low-power eyepiece.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 116.5 g, fully multi-coated 1.25″ 32 mm Plössl with a 48° field and 19 mm eye relief — a low-power finding and wide-field eyepiece.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722264346735,"sku":"W9101A","price":34.2,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9101a_20250807091309_4254_20260814161322_4170.webp?v=1791670288"},{"product_id":"svbony-sv135-7-21mm-zoom-eyepiece-52-36","title":"SVBONY SV135 1.25″ 7–21mm 52°–36° Zoom Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387599306152461862670958.jpg?v=1791669868\" alt=\"SVBONY SV135 7-21mm 52-36 degree zoom eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV135 52°–36° is a 1.25″ zoom eyepiece that changes focal length from 7 mm to 21 mm with a twist of the barrel, so one eyepiece covers the range of several fixed ones. It uses five elements in three groups of high-index glass, fully multi-coated, with an apparent field of 52° at 7 mm narrowing to 36° at 21 mm and 13–14 mm of eye relief. It weighs 95 g and has an M28.5 × 0.6 filter thread.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want one light eyepiece to move between magnifications on the Moon, Jupiter and Saturn, matching the power to the seeing without stopping to swap eyepieces.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387599306187768105565964.jpg?v=1791669868\" alt=\"SVBONY SV135 7-21mm zoom eyepiece for planetary and lunar viewing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7–21 mm linear zoom:\u003c\/strong\u003e continuous magnification change.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e52°–36° apparent field.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13–14 mm eye relief:\u003c\/strong\u003e with a rubber eyecup for use with or without glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated, 3 groups \/ 5 elements\u003c\/strong\u003e of high-index glass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety undercut on the barrel:\u003c\/strong\u003e helps keep it from slipping out of the focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened lens edges and anti-reflection threads:\u003c\/strong\u003e for contrast.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387599306223869997504390.jpg?v=1791669869\" alt=\"SVBONY SV135 7-21mm zoom eyepiece design details\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAs a linear zoom, the SV135 changes focal length in proportion to barrel rotation. Its five elements in three groups give a 52° field at 7 mm and 36° at 21 mm — the narrowing field at longer focal lengths is typical of zoom designs. On a 1000 mm telescope the range works out to roughly 48× to 143×.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9105b-2_20250807161536_5542.jpg?v=1791670292\" alt=\"SVBONY SV135 7-21mm zoom eyepiece with rubber eye guard\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanets:\u003c\/strong\u003e Jupiter, Saturn and Mars, zooming to match the seeing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoon:\u003c\/strong\u003e whole-disc to close-up crater views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStar clusters and nebulae\u003c\/strong\u003e at the lower-power end.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary photography:\u003c\/strong\u003e SVBONY also lists it for simple planetary imaging through the eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, for standard 1.25″ focusers and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 × 0.6 thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther SV135 versions:\u003c\/strong\u003e SVBONY also makes 57°–40° and 60°–40° versions with wider fields.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9105b-3_20250807161536_7516.jpg?v=1791670292\" alt=\"SVBONY SV135 7-21mm zoom eyepiece 1.25 inch barrel with safety undercut\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField narrows to 36° at 21 mm:\u003c\/strong\u003e narrower than a fixed eyepiece of that focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye relief:\u003c\/strong\u003e 13–14 mm, workable with many glasses but shorter than the 57°–40° SV135.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It inserts into a 1.25″ focuser or diagonal; twist the barrel to zoom and touch up focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will I get?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour telescope's focal length divided by 7 and by 21 — about 143× to 48× on a 1000 mm telescope.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is it different from the other SV135 zooms?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis is the lightest (95 g) with a 3-group, 5-element design and a 52°–36° field; the 57°–40° and 60°–40° versions use more elements for wider fields.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 95 g, fully multi-coated 1.25″ 7–21 mm zoom with a 52°–36° field — one eyepiece covering lunar and planetary magnifications.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722265067631,"sku":"W9105B","price":38.75,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9105b-0_20251230160657_4003.webp?v=1791670292"},{"product_id":"svbony-sv135-7-21mm-zoom-eyepiece-60-40","title":"SVBONY SV135 1.25″ 7–21mm 60°–40° Zoom Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387599343670693111174393.jpg?v=1791669869\" alt=\"SVBONY SV135 7-21mm 60-40 degree zoom eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV135 60°–40° (item W9105D) is a fully multi-coated 1.25″ zoom eyepiece that runs continuously from 7 mm to 21 mm. It is the widest-field SV135, with a 60° apparent field at 7 mm and 40° at 21 mm, from seven elements in four groups of high-index glass. Eye relief is 13–15 mm, the barrel has an M28.5 × 0.6 filter thread, and it weighs 145 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387599343704293863361889.jpg?v=1791669868\" alt=\"SVBONY SV135 7-21mm 60-40 degree zoom eyepiece optical design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want one eyepiece for the Moon, Jupiter and Saturn, nebulae and star clusters, and you value a wider field at high power — helpful for keeping a planet in view longer on a manual or undriven mount.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e7–21 mm linear zoom\u003c\/strong\u003e with a 60°–40° apparent field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 groups \/ 7 elements:\u003c\/strong\u003e fully multi-coated high-index glass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13–15 mm eye relief:\u003c\/strong\u003e rubber eye guard for comfort with glasses and to block stray light.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety undercut barrel:\u003c\/strong\u003e helps keep it seated in the focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eBlackened lens edges and anti-reflection threads.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM28.5 × 0.6 filter thread\u003c\/strong\u003e for 1.25″ accessories.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387599343736592705505396.jpg?v=1791669869\" alt=\"SVBONY SV135 7-21mm 60-40 degree zoom eyepiece barrel and thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eWith seven elements in four groups, this SV135 holds a wider field across the zoom range than the five- and six-element versions: 60° at 7 mm, 40° at 21 mm. The trade is weight — 145 g against 95 g and 133 g for the other two. On a 1000 mm telescope it gives roughly 48× to 143×.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9105d-2_20250807161957_0616.jpg?v=1791670293\" alt=\"SVBONY SV135 60-40 degree zoom eyepiece with rubber eye guard\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMoon and planets:\u003c\/strong\u003e Jupiter and Saturn at the power the seeing allows.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNebulae and star clusters,\u003c\/strong\u003e including diffuse nebulae, at the low-power end.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrab-and-go and outreach:\u003c\/strong\u003e one eyepiece in place of several.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, for standard 1.25″ focusers and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 × 0.6 thread, compatible with 1.25″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9105d-3_20250807161957_0850.jpg?v=1791670293\" alt=\"SVBONY SV135 60-40 degree zoom eyepiece 1.25 inch barrel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField narrows to 40° at 21 mm,\u003c\/strong\u003e as is typical of zooms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree SV135 versions:\u003c\/strong\u003e 52°–36°, 57°–40° and 60°–40° (this one), each with its own design and weight.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into a 1.25″ focuser or diagonal; twist to zoom and refocus slightly as needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe 13–15 mm eye relief and rubber eye guard are designed for use with glasses.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich SV135 has the widest field?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThis one: 60° at 7 mm and 40° at 21 mm.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 145 g, 4-group\/7-element 1.25″ 7–21 mm zoom with a 60°–40° field — the widest-field SV135 for lunar, planetary and cluster observing.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722265264239,"sku":"W9105D","price":78.38,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9105d-0_20251231152231_0727.webp?v=1791670293"},{"product_id":"svbony-sv190-10mm-ultra-flat-field-eyepiece","title":"SVBONY SV190 10mm 1.25″ Ultra Flat Field Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037183457111308977863.jpg?v=1791669917\" alt=\"SVBONY SV190 10mm ultra flat field eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV190 10 mm is a 1.25″ ultra flat field eyepiece with a 60° apparent field of view. Its 5-element, 4-group fully multi-coated design flattens field curvature toward the edge, so stars stay sharp across more of the view than in a simple Plössl. Eye relief is 16 mm, the field stop is 14.7 mm, and the barrel carries a standard M28.5×0.6 filter thread. It weighs 84 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149a-1_20250806175207_4553.jpg?v=1791670369\" alt=\"SVBONY SV190 10mm 1.25 inch ultra flat field eyepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a medium-high power eyepiece for the Moon, planets, double stars and smaller deep-sky objects, with a flatter field and more eye relief than a 10 mm Plössl, including if you observe with glasses.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra flat field:\u003c\/strong\u003e designed to reduce edge curvature and distortion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e60° apparent field\u003c\/strong\u003e at 10 mm focal length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16 mm eye relief\u003c\/strong\u003e with a rubber eyecup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 elements in 4 groups\u003c\/strong\u003e, fully multi-coated, with oversized lenses and blackened lens edges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium body\u003c\/strong\u003e with a filter-threaded 1.25″ barrel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037657636926234414168.jpg?v=1791669917\" alt=\"SVBONY SV190 10mm flat field eyepiece optical design panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe five-element layout uses oversized lenses and a field-flattening group so that the image stays in focus closer to the field stop. With a 14.7 mm field stop and 60° apparent field, the true field in your telescope is the 60° divided by the magnification (telescope focal length ÷ 10 mm). Broadband multi-coatings on all air-glass surfaces keep transmission and contrast up on bright targets.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing\u003c\/strong\u003e at medium-high magnification.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDouble stars and globular clusters.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall deep-sky objects\u003c\/strong\u003e such as planetary nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149a-2_20250806175207_4585.jpg?v=1791670369\" alt=\"SVBONY SV190 10mm eyepiece barrel and eyecup\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, fits 1.25″ focusers, diagonals and 2″-to-1.25″ adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread:\u003c\/strong\u003e M28.5×0.6 for standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread under the eyecup:\u003c\/strong\u003e M34×0.75.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion focal length:\u003c\/strong\u003e SVBONY makes the SV190 in 18 mm as well (65°, 20 mm eye relief).\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387056114060839864413406.jpg?v=1791669917\" alt=\"SVBONY SV190 10mm flat field eyepiece threads and eyecup detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye relief figure:\u003c\/strong\u003e SVBONY's specification table lists 16 mm; its description text mentions 10 mm. We list the table figure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e no 2″ skirt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNet weight 84 g\u003c\/strong\u003e; package size 110 × 76 × 70 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It drops into any 1.25″ focuser or diagonal and is held by the thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the apparent field?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e60°.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use filters with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The barrel takes standard M28.5×0.6 1.25″ filters.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY describes the eye relief as suitable for eyeglass wearers; the published figure is 16 mm.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 10 mm, 60° flat field 1.25″ eyepiece with 5-element FMC optics and 16 mm eye relief, for sharp medium-high power views of the Moon, planets and compact deep-sky objects.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722281287791,"sku":"W9149A","price":61.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149a-0_20251231154154_6726.webp?v=1791670369"},{"product_id":"svbony-sv190-18mm-ultra-flat-field-eyepiece","title":"SVBONY SV190 18mm 1.25″ Ultra Flat Field Eyepiece","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037921880978879594769.jpg?v=1791669920\" alt=\"SVBONY SV190 18mm ultra flat field eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV190 18 mm is a 1.25″ ultra flat field eyepiece with a 65° apparent field of view and 20 mm of eye relief. Its 8-element, 5-group fully multi-coated design keeps stars sharp from the centre to the edge, and its 23.4 mm field stop gives a wider view than typical Plössl eyepieces. The barrel takes standard M28.5×0.6 filters, and an M42×0.75 thread under the eyecup allows a camera to be attached for eyepiece projection.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20260314115625_9018.webp?v=1791670383\" alt=\"SVBONY SV190 18mm 1.25 inch ultra flat field eyepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a low-to-medium power 1.25″ eyepiece with a wide, flat field for deep-sky scanning, the full lunar disc and wide double stars, with eye relief comfortable enough for glasses.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e65° apparent field\u003c\/strong\u003e at 18 mm, wider than a standard Plössl.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20 mm eye relief\u003c\/strong\u003e with a rubber eyecup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8 elements in 5 groups\u003c\/strong\u003e, fully multi-coated.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlat field:\u003c\/strong\u003e sharp from centre to edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM42×0.75 thread under the eyecup\u003c\/strong\u003e for camera connection.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eLightweight, durable build.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387031149088578093963209.jpg?v=1791669920\" alt=\"SVBONY SV190 18mm flat field eyepiece 65 degree field feature panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe eight-element layout includes a field-flattening group, which is what keeps stars in focus out to the 23.4 mm field stop. At 18 mm and 65°, the true field in your telescope is 65° divided by the magnification (telescope focal length ÷ 18 mm), so it frames large clusters and nebulae that a narrower eyepiece crops.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeep-sky observing:\u003c\/strong\u003e open clusters, larger nebulae and galaxies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhole-Moon views\u003c\/strong\u003e at moderate power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAfocal or projection photography\u003c\/strong\u003e via the M42 thread under the eyecup; SVBONY notes it can be matched with the SV406P for scenery.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387031149122166355245243.jpg?v=1791669920\" alt=\"SVBONY SV190 18mm flat field eyepiece M42 camera thread detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″ for 1.25″ focusers, diagonals and 2″-to-1.25″ adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread:\u003c\/strong\u003e M28.5×0.6.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera thread:\u003c\/strong\u003e M42×0.75 under the eyecup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion focal length:\u003c\/strong\u003e SVBONY makes the SV190 in 10 mm as well (60°).\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149b-2_20250806174238_1172.jpg?v=1791670383\" alt=\"SVBONY SV190 18mm eyepiece barrel and threads\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20260314115626_0052.webp?v=1791670383\" alt=\"SVBONY SV190 18mm flat field eyepiece detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e no 2″ skirt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for the 18 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into any 1.25″ focuser or diagonal and is held by the thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I attach a camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Remove the eyecup to reach the M42×0.75 thread.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow wide is the view?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e65° apparent field with a 23.4 mm field stop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it good with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY describes the 20 mm eye relief as comfortable for eyeglass wearers.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 18 mm, 65° flat field 1.25″ eyepiece with 8-element FMC optics, 20 mm eye relief and an M42 camera thread, for wide, sharp deep-sky and lunar views.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722284728431,"sku":"W9149B","price":95.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9149b-0_20251231154451_0679.webp?v=1791670383"},{"product_id":"svbony-sv245-8-16mm-zoom-eyepiece","title":"SVBONY SV245 8–16 mm Zoom Eyepiece (1.25″ \/ 2″, 63°)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869269134401713365617.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV245 is an 8–16 mm zoom eyepiece with a 63° apparent field of view, a dual 1.25″ and 2″ barrel and click stops at each focal-length setting. Its 8-element, 5-group optical design is fully multi-coated with blackened lens edges, eye relief is 17–18 mm, and the eyepiece is parfocal across the zoom range. It measures 129 x 60 mm and weighs 486 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe the Moon and planets and want to step between magnifications to match the seeing without swapping eyepieces, if you observe with glasses and need room at the eyecup, or if you use an SVBONY spotting scope that SVBONY lists as compatible.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8–16 mm, 2x zoom:\u003c\/strong\u003e a 63° apparent field that stays consistent as you zoom.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8 elements in 5 groups:\u003c\/strong\u003e fully multi-coated optics with blackened lens edges for contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClick-stop design:\u003c\/strong\u003e a detent at each focal length from 8 mm to 16 mm for repeatable settings without play.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal:\u003c\/strong\u003e focus holds closely through the zoom range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17–18 mm eye relief:\u003c\/strong\u003e with a folding rubber eye guard for observing with or without glasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual barrel:\u003c\/strong\u003e stainless-steel 1.25″ barrel and aluminium-alloy 2″ barrel, with M28.5 x 0.6 and M48 x 0.75 filter threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstigmatism corrector support:\u003c\/strong\u003e mainstream correctors can be fitted.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869268995673331189664.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece 8-element optical design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe eight elements are arranged in five groups, with multi-coating on every air-to-glass surface and blackened edges to suppress stray light. Holding a 63° field across a 2x zoom range keeps the framing familiar as magnification changes, and parfocal behaviour means the image stays close to focus while you move between settings. The long eye relief comes from the eyepiece's optical layout, so the full field is visible from behind eyeglasses.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869269068745829141512.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece 17–18 mm eye relief\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and lunar observing:\u003c\/strong\u003e zoom in and out with the seeing to find the sharpest magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble stars and clusters\u003c\/strong\u003e at medium to high power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDaytime spotting-scope use:\u003c\/strong\u003e SVBONY lists the SA401 APO and SV406P spotting scopes as compatible.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869269036599698874126.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece click-stop zoom detents\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387869269102285073699800.jpg?v=1791670100\" alt=\"SVBONY SV245 8–16 mm zoom eyepiece click-stop detail\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocusers and diagonals:\u003c\/strong\u003e fits 1.25″ and 2″ eyepiece holders; the 2″ lens interface is included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the 1.25″ barrel, M48 x 0.75 on the 2″ barrel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpotting scopes:\u003c\/strong\u003e SVBONY lists the SA401 APO and SV406P; the SA406 eyepiece adapter connects the SA401 to the SV245.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstigmatism correctors:\u003c\/strong\u003e mainstream correctors can be installed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SVBONY SV245 8–16 mm zoom eyepiece\u003c\/li\u003e\n\u003cli\u003e1 x 2″ lens interface\u003c\/li\u003e\n\u003cli\u003e3 x Dust caps\u003c\/li\u003e\n\u003cli\u003e1 x Eyepiece soft bag\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e at 486 g it is heavier than most fixed eyepieces, which is worth accounting for in balance on a small mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter diameter:\u003c\/strong\u003e 60 mm, so it suits diagonals and focusers that clear a 60 mm body.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit pupil:\u003c\/strong\u003e focal length and magnification depend on your telescope; get in touch if you want us to work out the range for your scope.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It drops into a 1.25″ holder directly or into a 2″ holder with the included interface, and you zoom by turning the barrel between click stops.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to refocus when zooming?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eVery little. SVBONY specifies the SV245 as parfocal, so only small focus touch-ups are typical.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Eye relief is 17–18 mm and the eye guard folds down for glasses wearers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it compare with the SV230?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY publishes the SV245 at 8–16 mm with a 63° field, 8 elements in 5 groups and 486 g; the SV230 covers 8–20 mm with a 57–72° field, 9 elements in 6 groups and 500 g.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 8–16 mm, 63° zoom eyepiece with click stops, parfocal operation, 17–18 mm eye relief and a dual 1.25″\/2″ barrel, suited to high-power planetary and lunar observing.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722301767791,"sku":"W9192A","price":227.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9192A-0_20260408151225_8862.webp?v=1791670462"},{"product_id":"svbony-f9132a-12-5mm-illuminated-reticle-eyepiece","title":"SVBONY 12.5mm Illuminated Reticle Eyepiece 1.25″ (Double Crosshair)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378847980661524467861794.jpg?v=1791669969\" alt=\"SVBONY F9132A 12.5mm illuminated reticle eyepiece overview\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY F9132A is a 1.25″, 12.5 mm Plössl eyepiece with an illuminated double-crosshair reticle. A red LED lights the reticle, with stepless brightness control powered by three 1.5 V alkaline batteries, so the crosshairs stay visible against a dark sky without overwhelming faint stars. The four-element, fully multi-coated Plössl gives a 40° apparent field with 11 mm of eye relief. The aluminium body has a matte finish, measures 70 x 60 x 60 mm, and weighs 170 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378847982730000483374151.jpg?v=1791669969\" alt=\"SVBONY F9132A double crosshair illuminated reticle\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you need an accurate centring reference in the eyepiece: aligning a go-to mount on its alignment stars, centring a guide star, or checking polar alignment and tracking for astrophotography.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRed LED double-crosshair reticle:\u003c\/strong\u003e a precise centre reference that stays readable at night.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStepless brightness:\u003c\/strong\u003e set the reticle just bright enough to see against the star.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12.5 mm focal length, 40° field:\u003c\/strong\u003e moderate power for accurate centring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e11 mm eye relief:\u003c\/strong\u003e comfortable for longer alignment sessions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated optics with blackened edges and inner walls:\u003c\/strong\u003e for bright, high-contrast star images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree 1.5 V alkaline batteries:\u003c\/strong\u003e power the illuminator.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378847984697513418194637.jpg?v=1791669969\" alt=\"SVBONY F9132A illuminated eyepiece optics and coatings\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378847986643499648746765.jpg?v=1791669969\" alt=\"SVBONY F9132A illuminated eyepiece brightness control and battery\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe F9132A uses a four-element Plössl design with the reticle placed at the eyepiece's focal plane, so the crosshairs and the star come to focus together. The magnification it gives is your telescope's focal length divided by 12.5: 80x on a 1000 mm telescope, 40x on a 500 mm one. That is enough power to centre a star accurately while keeping a 40° field around it.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387090692454091835650056.jpg?v=1791669969\" alt=\"SVBONY F9132A 12.5mm illuminated eyepiece detail panel\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGo-to alignment:\u003c\/strong\u003e centring alignment stars precisely for better pointing accuracy.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePolar alignment checks and drift alignment.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuide-star centring:\u003c\/strong\u003e for manual guiding or confirming a star is centred.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, for any 1.25″ focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e three 1.5 V alkaline batteries.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e this listing is the eyepiece alone. SVBONY also offers it with a UV\/IR filter; get in touch if you want that combination.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6378848046525539683031103.jpg?v=1791669969\" alt=\"SVBONY F9132A illuminated reticle eyepiece specifications and package\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate field:\u003c\/strong\u003e at 40° apparent field it is a centring and alignment tool rather than a wide-field viewing eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBatteries:\u003c\/strong\u003e three 1.5 V alkaline cells power the illuminator.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Insert it like any 1.25″ eyepiece, switch on the illuminator and turn the brightness up until the crosshairs are just visible against the star.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will it give?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour telescope's focal length divided by 12.5. On a 1000 mm telescope that is 80x.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy a double crosshair?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe two parallel lines frame the star, which makes it easier to judge when it is exactly centred than a single line would.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 12.5 mm, 40° 1.25″ Plössl with a stepless red double-crosshair reticle, for accurate star centring during alignment and guiding.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Eyepiece","offer_id":67722308911215,"sku":"F9132A","price":41.31,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9132a-1_20250807113846_5266_20260822140244_2615.webp?v=1791670495"},{"product_id":"svbony-f9149a-25mm-plossl-eyepiece","title":"SVBONY 25mm Plossl Eyepiece 1.25″ FMC","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371496238243620362446199.jpg?v=1791669969\" alt=\"SVBONY F9149A 25mm Plossl eyepiece overview\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY F9149A is a 25 mm, 1.25″ Plössl eyepiece. It uses a four-element symmetrical Plössl design in two groups, fully multi-coated, with blackened lens edges and an internally blackened barrel for contrast. It gives a 40° apparent field, accepts standard 1.25″ filters on its M28.5 x 0.6 thread, has a rubber eye guard, stands 72 mm (2.82″) tall and weighs 79 g (2.8 oz). It ships in a protective plastic case.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9149a-1_20250807112316_0136_20260820165408_4446.webp?v=1791670543\" alt=\"SVBONY F9149A 25mm 1.25″ Plossl eyepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a dependable medium-low-power eyepiece for a 1.25″ focuser, for general observing of the Moon, planets, double stars and brighter deep-sky objects.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-element Plössl, 2 groups:\u003c\/strong\u003e a symmetrical design known for sharp, well-corrected images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated optics:\u003c\/strong\u003e improve light transmission and reduce reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened lens edges and barrel interior:\u003c\/strong\u003e cut stray light for better contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ filter thread (M28.5 x 0.6):\u003c\/strong\u003e takes standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRubber eye guard:\u003c\/strong\u003e blocks side light and helps position your eye.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371496238244682848180460.jpg?v=1791669969\" alt=\"SVBONY F9149A 25mm Plossl eyepiece fully multi-coated optics\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371496238251248792246366.jpg?v=1791669969\" alt=\"SVBONY F9149A 25mm Plossl eyepiece blackened barrel and filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneral observing:\u003c\/strong\u003e 25 mm gives moderate magnification, 40x on a 1000 mm telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary overviews\u003c\/strong\u003e and binary stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrighter clusters and nebulae\u003c\/strong\u003e at modest power.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, for any 1.25″ focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e standard 1.25″ filters thread into the barrel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarlow:\u003c\/strong\u003e works with a 1.25″ Barlow for higher power.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eSVBONY 25 mm Plössl eyepiece, packed in a protective plastic case\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371496241136305759271047.jpg?v=1791669969\" alt=\"SVBONY F9149A 25mm Plossl eyepiece protective case\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField of view:\u003c\/strong\u003e 40° apparent; for a wider view at a similar focal length, a wide-angle design is the alternative.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e it does not fit 2″-only focusers without an adapter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Slide it into the focuser or diagonal, tighten the thumbscrew and focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will it give?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour telescope's focal length divided by 25. For example, 40x on a 1000 mm telescope or 26x on a 650 mm one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I add filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The barrel takes standard 1.25″ filters on its M28.5 x 0.6 thread.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 79 g, fully multi-coated 25 mm 1.25″ Plössl with a 40° field and filter thread, for everyday observing at moderate power.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722323296367,"sku":"F9149A","price":22.73,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9149a-1_20250807112316_0136_20260820165408_4446.webp?v=1791670543"},{"product_id":"svbony-sv221-1-25-45-degree-erect-prism-diagonal","title":"SVBONY SV221 1.25″ 45° Erect-Image Prism Diagonal","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6382466889884136253897484.jpg?v=1791669977\" alt=\"SVBONY SV221 1.25 inch 45 degree correct image prism diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV221 is a 1.25″ prism diagonal that turns the light path through 45° and delivers an erect, non-reversed image – right-side-up and correct left-to-right. It has a 19 mm clear aperture, a multi-coated prism and an optical length of about 86 mm. The housing combines ABS with aluminium end barrels, the nosepiece carries an M28.5 x 0.6 filter thread, the eyepiece holder clamps by screw with a brass compression ring, and the diagonal weighs 79 g (2.78 oz).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you use a refractor or a Maksutov or Schmidt-Cassegrain for both daytime terrestrial viewing and night-sky observing and want an image that matches what you see with your eyes, at a comfortable 45° viewing angle.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726473051115629530435.jpg?v=1791669978\" alt=\"SVBONY SV221 45 degree diagonal 1.25 inch barrel and eyepiece holder\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eErect, non-reversed image:\u003c\/strong\u003e correct orientation for terrestrial targets and easier star-hopping with a printed chart.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e45° deflection:\u003c\/strong\u003e a natural angle for viewing objects low on the horizon and land targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-coated prism:\u003c\/strong\u003e SVBONY specifies higher light transmission.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter thread:\u003c\/strong\u003e M28.5 x 0.6 inside the nosepiece for 1.25″ filters, with internal blackening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass compression ring:\u003c\/strong\u003e brass locking screws and ring protect eyepiece and barrel finishes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726475849621144304119.jpg?v=1791669977\" alt=\"SVBONY SV221 45 degree diagonal aluminium barrels and coated prism\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726477847577129682512.jpg?v=1791669977\" alt=\"SVBONY SV221 45 degree diagonal 1.25 inch filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726479343277608978085.jpg?v=1791669977\" alt=\"SVBONY SV221 45 degree diagonal brass compression ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar and planetary observing\u003c\/strong\u003e, which SVBONY lists as its main night-sky use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerrestrial viewing and birding\u003c\/strong\u003e through a small refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePublic outreach and casual sessions\u003c\/strong\u003e, where an upright image is easier for everyone at the eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726481941620816678671.jpg?v=1791669978\" alt=\"SVBONY SV221 45 degree diagonal for Moon and planet viewing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescopes:\u003c\/strong\u003e refractors and catadioptrics such as Schmidt-Cassegrain and Maksutov-Cassegrain telescopes with a 1.25″ visual back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e any 1.25″ eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the nosepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNewtonians and Dobsonians:\u003c\/strong\u003e these do not use a diagonal, and SVBONY does not recommend the SV221 for them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SV221 1.25″ 45° correct-image prism diagonal\u003c\/li\u003e\n\u003cli\u003e3 x M3 screws\u003c\/li\u003e\n\u003cli\u003e1 x dust cap\u003c\/li\u003e\n\u003cli\u003e1 x dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385726483057733706721669.jpg?v=1791669977\" alt=\"SVBONY SV221 45 degree diagonal package contents\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ only:\u003c\/strong\u003e the barrel and eyepiece holder take 1.25″ accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical length about 86 mm:\u003c\/strong\u003e if your telescope has limited inward focus travel, send us the model and we will confirm it reaches focus with this diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the telescope's 1.25″ focuser or visual back and the eyepiece locks into it with the thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does erect image mean?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe view is right-side-up and not mirror-reversed, the same orientation you see with your eyes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it at night?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. SVBONY lists it for Moon and planet viewing, alongside daytime targets.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on my Newtonian?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNewtonian and Dobsonian telescopes do not use a diagonal, so it is not intended for them.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 79 g, 1.25″ 45° prism diagonal with an erect, non-reversed image and filter threads for refractors and catadioptric telescopes used both day and night.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722333716591,"sku":"W9178B","price":25.07,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9178b_20250806143657_4091_20260810135616_0538.webp?v=1791670572"},{"product_id":"svbony-sv221-1-25-90-degree-mirror-diagonal","title":"SVBONY SV221 1.25″ 90° Mirror Diagonal","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741516607160316958546.jpg?v=1791669981\" alt=\"SVBONY SV221 1.25 inch 90 degree mirror diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV221 90° is a 1.25″ mirror star diagonal that turns the light path through a right angle so you can look down into the eyepiece rather than crouching behind the telescope. The aluminium-coated mirror has a reflectivity above 92% and a clear aperture of 29.5 mm, the optical length is about 73 mm, and the diagonal weighs 90.5 g (3.19 oz). The nosepiece carries an M28.5 x 0.6 filter thread, and the eyepiece holder uses a brass pressure ring and screw clamp.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe with a refractor, Maksutov-Cassegrain or Schmidt-Cassegrain and want a light, inexpensive 1.25″ diagonal for comfortable viewing near the zenith, or a spare diagonal for a travel or grab-and-go telescope.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e90° right-angle design:\u003c\/strong\u003e comfortable viewing posture, especially for objects high in the sky.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAluminium-coated mirror:\u003c\/strong\u003e reflectivity above 92%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e29.5 mm clear aperture:\u003c\/strong\u003e full illumination for 1.25″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass pressure ring:\u003c\/strong\u003e holds the eyepiece without the screw touching its barrel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight construction:\u003c\/strong\u003e ABS housing with aluminium barrels, brass lock screws and a dust cover; 90.5 g in total.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741519395048632772069.jpg?v=1791669981\" alt=\"SVBONY SV221 90 degree diagonal aluminium die structure\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741521399283119833394.jpg?v=1791669981\" alt=\"SVBONY SV221 90 degree diagonal brass pressure ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar, planetary and deep-sky observing\u003c\/strong\u003e with 1.25″ eyepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComfortable viewing near the zenith\u003c\/strong\u003e on refractors and catadioptrics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasual daytime viewing and birding,\u003c\/strong\u003e keeping in mind the mirror-reversed image described below.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescopes:\u003c\/strong\u003e refractors and catadioptrics such as Schmidt-Cassegrain and Maksutov-Cassegrain telescopes with a 1.25″ focuser or visual back.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e any 1.25″ eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e M28.5 x 0.6 thread on the nosepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImage orientation:\u003c\/strong\u003e upright but mirror-reversed left to right, as with any single-mirror diagonal. The SV221 45° prism version gives a fully correct image if you need one for land viewing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741525434271981431665.jpg?v=1791669982\" alt=\"SVBONY SV221 mirror diagonal image orientation versus normal image\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SV221 1.25″ 90° mirror diagonal\u003c\/li\u003e\n\u003cli\u003e3 x M3 screws\u003c\/li\u003e\n\u003cli\u003e1 x dust cap\u003c\/li\u003e\n\u003cli\u003e1 x dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385741529117361807069902.jpg?v=1791669982\" alt=\"SVBONY SV221 90 degree diagonal package contents\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMirror-reversed image:\u003c\/strong\u003e normal for astronomy; for land viewing an erect-image prism diagonal gives a correct view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNewtonians and Dobsonians:\u003c\/strong\u003e these telescopes do not use a diagonal, and SVBONY does not recommend the SV221 for them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the 1.25″ focuser or visual back, and the eyepiece locks into it with the thumbscrew and brass ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it reverse the image?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe image is upright but reversed left to right, which is standard for a mirror diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I add filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 1.25″ filters thread into the M28.5 x 0.6 nosepiece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my telescope?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt fits any refractor or catadioptric with a 1.25″ focuser or visual back.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a light 1.25″ 90° mirror diagonal with a 29.5 mm aperture, over 92% reflectivity, a brass compression ring and filter threads for refractors and catadioptric telescopes.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722340171887,"sku":"W9178A","price":21.36,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9178a_20250806150235_2192_20260810144007_6755.webp?v=1791670612"},{"product_id":"svbony-f9122a-40mm-plossl-eyepiece","title":"SVBONY 40mm Plossl Eyepiece 1.25″ FMC","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371470598933173055285636.jpg?v=1791669969\" alt=\"SVBONY F9122A 40mm Plossl 1.25″ eyepiece overview\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY F9122A is a 40 mm, 1.25″ Plössl eyepiece in an all-metal body. It uses a fully multi-coated four-element design in two groups with blackened lens edges and internal threading to cut reflections, and has a rubber eyecup and an M28.5 x 0.6 filter thread. SVBONY's specification table lists a 40° apparent field. It is 79 mm (3.11″) tall and weighs 82 g (2.9 oz).\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9122a-1_20250807112545_1485_20260820165308_5947.webp?v=1791670628\" alt=\"SVBONY F9122A 40mm 1.25″ Plossl eyepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want the lowest practical power for a 1.25″ focuser: an eyepiece for finding objects, framing the whole Moon and sweeping star fields and larger deep-sky objects.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 mm focal length:\u003c\/strong\u003e low magnification and the widest true field a 1.25″ barrel allows in this design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated optics, 2 groups \/ 4 elements:\u003c\/strong\u003e for brightness and contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened lens edges and internal threading:\u003c\/strong\u003e reduce stray reflections.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAll-metal body with rubber eyecup.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM28.5 x 0.6 filter thread:\u003c\/strong\u003e takes standard 1.25″ filters.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinding and centring objects\u003c\/strong\u003e before switching to higher power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhole-disc lunar views\u003c\/strong\u003e and wide star fields.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge deep-sky objects\u003c\/strong\u003e such as open clusters and extended nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eOn a 1000 mm telescope it gives 25x; on a 650 mm telescope, about 16x.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, for any 1.25″ focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e standard 1.25″ filters thread into the barrel.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9122a-2_20250807112545_2193.jpg?v=1791670629\" alt=\"SVBONY F9122A 40mm Plossl eyepiece filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExit pupil on fast telescopes:\u003c\/strong\u003e a 40 mm eyepiece on an f\/8 or faster telescope produces a large exit pupil (5 mm at f\/8), which suits dark-adapted eyes; on very fast scopes some light may fall outside the pupil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye relief:\u003c\/strong\u003e long-focal-length Plössls have generous eye relief, so the rubber eyecup helps you find the right eye position.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Slide it into the focuser or diagonal, tighten the thumbscrew and focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will it give?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYour telescope's focal length divided by 40, for example 25x on a 1000 mm telescope.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I add filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It has an M28.5 x 0.6 thread for standard 1.25″ filters.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an 82 g all-metal, fully multi-coated 40 mm 1.25″ Plössl for the lowest power and widest view in a 1.25″ focuser.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722342793327,"sku":"F9122A","price":24.23,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9122a-1_20250807112545_1485_20260820165308_5947.webp?v=1791670628"},{"product_id":"svbony-sv222-1-25-45-degree-correct-image-prism-diagonal","title":"SVBONY SV222 1.25″ 45° Correct-Image Prism Diagonal (Metal, FMC)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871100284965108869339.jpg?v=1791669990\" alt=\"SVBONY SV222 1.25 inch 45 degree correct image prism diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV222 45° is a 1.25″ correct-image prism diagonal that gives an erect, non-reversed view at a 45° angle. The BK7 prism is fully multi-coated and phase-coated for contrast, the body is CNC-machined aluminium with black anodizing, and the interior is baffled and matte-blackened against stray light. Clear aperture is 16 mm, optical length about 93 mm, the nosepiece carries an M28.5 x 0.6 filter thread, and the diagonal weighs 167 g (5.87 oz).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you use a refractor for both terrestrial and astronomical viewing and want a metal-bodied correct-image diagonal with phase-coated optics, for example for birding by day and lunar or planetary observing at night.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e45° upright BK7 prism:\u003c\/strong\u003e correct daytime orientation, right-side-up and non-reversed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated plus phase coating:\u003c\/strong\u003e SVBONY specifies high contrast and a bright, clear image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC aluminium body:\u003c\/strong\u003e black anodized for durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaffled and matte interior:\u003c\/strong\u003e blackened, baffled light path to suppress internal reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass pressure ring and large chrome thumbscrew:\u003c\/strong\u003e holds the eyepiece firmly without marking it, and is easy to operate with gloves.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871102103575103074282.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree upright prism with multi-layer and phase coating\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871103196903979882276.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal anodized aluminium body\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871104260814206315319.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal internal baffle design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA correct-image diagonal uses a roof-type prism to invert and revert the image in the same element that turns the light path, so what you see matches the scene in front of you. Phase coatings on the prism's roof faces counter the phase shift that otherwise softens contrast in roof prisms. The internal baffle and matting keep off-axis light out of the eyepiece.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871105292205474943389.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal matte black interior\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871107970602847855953.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal brass pressure ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871108974335366715892.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal large chrome thumbscrew\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerrestrial viewing and birding\u003c\/strong\u003e with a refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary and deep-sky visual observing\u003c\/strong\u003e, which SVBONY lists for refractors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutreach\u003c\/strong\u003e, where an upright, correctly oriented image helps new observers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871110920096872757460.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal connected to a telescope\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSVBONY illustrates the SV222 connected to a telescope, a Barlow lens, an eyepiece and 1.25″ filters:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 1.25″ barrel with an internal M28.5 x 0.6 thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarlow lens:\u003c\/strong\u003e a 1.25″ Barlow fits the eyepiece holder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e any 1.25″ eyepiece, held by screw clamp and brass ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e standard 1.25″ filters thread into the nosepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871111909460967526333.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal connected to a Barlow lens\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871112895284221320868.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal connected to an eyepiece\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385871114351126676608662.jpg?v=1791669991\" alt=\"SVBONY SV222 45 degree diagonal with 1.25 inch telescope filters\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SV222 1.25″ 45° metal correct-image prism diagonal\u003c\/li\u003e\n\u003cli\u003eM4 screws\u003c\/li\u003e\n\u003cli\u003e1 x dust cap\u003c\/li\u003e\n\u003cli\u003e1 x dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16 mm clear aperture:\u003c\/strong\u003e as published by SVBONY. If you want to check it against a particular wide-field eyepiece, send us the model and we will look at it with you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefractor use:\u003c\/strong\u003e SVBONY lists it for refractors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the 1.25″ focuser and the eyepiece locks in with the large thumbscrew.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is it different from the SV221 45°?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe SV222 has a CNC aluminium body, a BK7 prism with full multi-coating plus phase coating, and an internally baffled light path; the SV221 has an ABS housing with aluminium barrels and a larger 19 mm aperture.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use filters with it?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes, 1.25″ filters thread into the M28.5 x 0.6 nosepiece.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a metal-bodied 1.25″ 45° correct-image diagonal with a phase-coated BK7 prism and baffled interior for refractors used day and night.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722349281391,"sku":"W9179A","price":56.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9179a_20250806143548_7648_20260810144025_3738.webp?v=1791670661"},{"product_id":"svbony-f9157-66-degree-ultra-wide-eyepiece","title":"SVBONY 66° Ultra Wide Eyepiece 1.25″ (6, 9, 15, 20 mm)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103537233876538947073.jpg?v=1791669969\" alt=\"SVBONY F9157 66 degree ultra wide 1.25″ eyepiece overview\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY F9157 series are 1.25″ ultra-wide eyepieces with a 66° apparent field of view and 16 mm of eye relief across the range, in 6 mm (F9157A), 9 mm (F9157B), 15 mm (F9157C) and 20 mm (F9157D) focal lengths. The optics are fully multi-coated, the optic edges and interior are blackened, and the aluminium barrels have a two-step anodized matte finish and threads for 1.25″ filters. A fold-down rubber eyecup works with or without glasses.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103540893031306442761.jpg?v=1791669969\" alt=\"SVBONY F9157 66 degree eyepiece optics and field of view\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a wider field than a Plössl with comfortable eye relief, including if you observe with glasses, across a range that covers low, medium and high power.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e66° apparent field:\u003c\/strong\u003e a wide view for lunar, cluster and nebula observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16 mm eye relief on every focal length:\u003c\/strong\u003e the same comfortable eye position throughout the set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully multi-coated optics:\u003c\/strong\u003e for bright, true-colour views.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlackened edges and interior:\u003c\/strong\u003e reduce stray light and internal reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25″ filter thread:\u003c\/strong\u003e takes SVBONY and other standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFold-down eyecup:\u003c\/strong\u003e for use with or without eyeglasses.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103542190598665903451.jpg?v=1791669969\" alt=\"SVBONY F9157 66 degree eyepiece lens group design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eEach focal length uses its own multi-element design: 5 elements in 3 groups for the 6 mm, 6 elements in 4 groups for the 9 mm, 4 elements in 3 groups for the 15 mm, and 5 elements in 3 groups for the 20 mm. The extra elements over a four-element Plössl are what allow the wider 66° field and the constant 16 mm eye relief, particularly at the short focal lengths where a Plössl's eye relief becomes very tight.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103544238055389881702.jpg?v=1791669969\" alt=\"SVBONY F9157 66 degree eyepiece blackened interior and filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6 mm and 9 mm:\u003c\/strong\u003e the Moon and planets at high and medium-high power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15 mm:\u003c\/strong\u003e star clusters, lunar overviews and planetary nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e20 mm:\u003c\/strong\u003e wide views of nebulae, clusters and star fields.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103552846521428883771.jpg?v=1791669969\" alt=\"SVBONY F9157 66 degree eyepiece fold-down eyecup and body\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarrel:\u003c\/strong\u003e 1.25″, for any 1.25″ focuser or diagonal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilters:\u003c\/strong\u003e threaded for standard 1.25″ filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal length:\u003c\/strong\u003e this listing is currently set up for the 6 mm (F9157A); contact us for the 9, 15 or 20 mm, or the set, while we add them.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6373103548155555661563582.jpg?v=1791669969\" alt=\"SVBONY F9157 66 degree eyepiece range 6mm 9mm 15mm 20mm\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh power and seeing:\u003c\/strong\u003e the 6 mm gives high magnification, which is most rewarding on steady nights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e SVBONY does not publish a weight for these eyepieces.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into a 1.25″ focuser or diagonal like any eyepiece; tighten the thumbscrew and focus.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with glasses?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. The 16 mm eye relief and fold-down eyecup are designed for observing with or without eyeglasses.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat magnification will each give?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eDivide your telescope's focal length by the eyepiece focal length. On a 1000 mm telescope: 167x (6 mm), 111x (9 mm), 67x (15 mm) and 50x (20 mm).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: 1.25″ fully multi-coated eyepieces with a 66° field and 16 mm eye relief throughout, in 6, 9, 15 and 20 mm, for the Moon, planets and deep sky.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"6 mm","offer_id":67722351116399,"sku":"F9157A","price":45.6,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/f9157_20250806175622_2795_20260810142812_2172.webp?v=1791670671"},{"product_id":"svbony-sv222-1-25-90-degree-erect-prism-diagonal","title":"SVBONY SV222 1.25″ 90° Erect-Image Prism Diagonal (Metal)","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870884191402725418587.jpg?v=1791669997\" alt=\"SVBONY SV222 1.25 inch 90 degree erect prism diagonal key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV222 90° is a 1.25″ erect-image prism diagonal that gives a right-side-up, non-reversed view at a right angle, so the scene in the eyepiece matches the scene in front of you while you keep a comfortable viewing posture. The BK7 prism has anti-reflection coatings, the body is CNC-machined aluminium, the clear aperture is 19 mm and the optical length about 65.6 mm. The nosepiece carries an M28.5 x 0.6 filter thread, and the diagonal weighs 153.8 g (5.43 oz).\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you use a refractor or catadioptric telescope for both daytime and night-sky viewing and want a correctly oriented image without giving up the comfort of a 90° diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eErect, non-reversed image at 90°:\u003c\/strong\u003e correct orientation for land targets and easier comparison with star charts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-coated BK7 prism:\u003c\/strong\u003e reduces reflection and scatter for a clearer image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatted interior and velvet side panels:\u003c\/strong\u003e absorb stray light inside the housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrass pressure ring:\u003c\/strong\u003e protects the eyepiece barrel and allows quick eyepiece changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepiece stopper and cone anti-drop insert:\u003c\/strong\u003e keep the eyepiece seated and aligned.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-metal CNC aluminium body:\u003c\/strong\u003e built for long-term use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870885408903886503548.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal multi-coated optics\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870886610514972545217.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal matting and thread design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870887642290779578754.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal matting velvet on side panels\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eOptical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 90° erect-image diagonal uses a roof-type prism that inverts and reverts the image while turning the light path through a right angle. The roof edge produces a faint line through the centre of the field, and SVBONY notes that it can show as a reflection or spike on very bright stars and planets against a dark sky.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870888525608771362792.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal brass pressure ring\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870889375020837481174.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal eyepiece stopper and cone insert\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerrestrial viewing and birding\u003c\/strong\u003e with a refractor or Maksutov.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLunar observing and casual night-sky viewing\u003c\/strong\u003e with a correctly oriented image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutreach\u003c\/strong\u003e, where an upright, non-reversed view is easier for everyone at the eyepiece.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870890422524195421157.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal 1.25 inch filter thread\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope side:\u003c\/strong\u003e 1.25″ barrel with an internal M28.5 x 0.6 filter thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyepieces:\u003c\/strong\u003e any 1.25″ eyepiece, held by screw clamp and brass ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescopes:\u003c\/strong\u003e refractors and catadioptrics with a 1.25″ focuser or visual back. SVBONY does not recommend it for Newtonian or Dobsonian reflectors.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870891338413334528940.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal all-metal construction\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6385870892253715355172566.jpg?v=1791669997\" alt=\"SVBONY SV222 90 degree diagonal image before and after comparison\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhat's in the Box\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 x SV222 1.25″ 90° metal correct-image prism diagonal\u003c\/li\u003e\n\u003cli\u003eM4 screws\u003c\/li\u003e\n\u003cli\u003e1 x dust cap\u003c\/li\u003e\n\u003cli\u003e1 x dust plug\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoof-prism line:\u003c\/strong\u003e a faint line can appear on very bright point sources, as SVBONY notes; a mirror diagonal such as the SV221 90° has no roof edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNewtonians and Dobsonians:\u003c\/strong\u003e these telescopes do not use a diagonal.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It slides into the 1.25″ focuser or visual back and the eyepiece locks in with the thumbscrew and brass ring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the image reversed?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It is upright and non-reversed, the same as looking with your eyes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it for astronomy?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It suits the Moon and general night-sky viewing; very bright stars and planets may show the faint roof-prism line SVBONY describes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it accept filters?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. 1.25″ filters thread into the M28.5 x 0.6 nosepiece.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: an all-metal 1.25″ 90° erect-image prism diagonal with a coated BK7 prism and filter thread that gives refractors and catadioptrics a correct, comfortable view by day and night.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722357801071,"sku":"W9179B","price":92.33,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/w9179b_20250806143349_3909_20260810144042_9534.webp?v=1791670708"}],"url":"https:\/\/ontariotelescope.com\/collections\/svbony-eyepieces-diagonals.oembed?page=2","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}